
// $.cookie('username'); //获得cookie
// $.cookie('username', '张三'); //设置cookie
// $.cookie('username', '李四', { expires: 3 }); //设置带时间的cookie 3天
// $.cookie('username', '', { expires: -1 }); //删除cookie
// $.cookie('username', null); //删除 cookie
jQuery.cookie = function (name, value, options) {
	if (typeof value != 'undefined') {
		options = options || {};
		if (value === null) {
			value = '';
			options.expires = -1;
		}
		var expires = '';
		if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
			var date;
			if (typeof options.expires == 'number') {
				date = new Date();
				date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
			} else {
				date = options.expires;
			}
			expires = ';expires=' + date.toUTCString();
		}
		var path = options.path ? ';path=' + options.path : '';
		var domain = options.domain ? ';domain=' + options.domain : '';
		var secure = options.secure ? ';secure' : '';
		document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
	} else {
		var cookieValue = null;
		if (document.cookie && document.cookie != '') {
			var cookies = document.cookie.split(';');
			for (var i = 0; i < cookies.length; i++) {
				var cookie = jQuery.trim(cookies[i]);
				if (cookie.substring(0, name.length + 1) == (name + '=')) {
					cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
					break;
				}
			}
		}
		return cookieValue;
	}
};